Which action best preserves a fire scene?

• A. Post line tape immediately after the fire is under control
• B. Post a law enforcement officer at every exterior door of the structure
• C. Protect the scene from excessive overhaul
• D. Use a helmet cam to document the scene during fire attack

Answer: (C)

Preserving a fire scene means keeping it as intact as possible so investigators can determine origin and cause and collect evidence without contamination or alteration. The action that best achieves this is protecting the scene from excessive overhaul. Overhaul involves tearing into walls, removing debris, and otherwise disturbing the area to find hidden pockets of heat or fire. When this happens too much, you can destroy burn patterns, misplace or remove potential evidence, and wash away trace residues that might point to a cause. By limiting disturbance and keeping the scene as it was left after extinguishment, investigators have a clearer, more reliable snapshot of what happened and when.

Other measures like posting line tape, assigning a security presence at doors, or documenting with video can help manage the scene, but they don’t actively prevent disturbance of evidence and scene integrity to the same degree as minimizing overhaul.